let str = 'Damn'
let num = 123
let flag = false
let un = undefined
let nu = null

let obj = {}
let arr = []
let fn = function (){}

console.log(typeof (str));  // String
console.log(typeof (num));  // Number
console.log(typeof (flag)); // Boolean
console.log(typeof (un));   // Undefined

console.log(typeof (nu));   // Object

console.log(typeof (obj));  // Object
console.log(typeof (arr));  // Object
console.log(typeof (fn));   // Function

